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                <h1 class="post-title" itemprop="name headline"> Winpcap网络编程六之两台主机通过中间主机通信 </h1>
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                    <time title="创建时间：2015-07-13 01:19:22" itemprop="dateCreated datePublished" datetime="2015-07-13T01:19:22+08:00">2015-07-13</time>
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                <h2 id="本节任务"><a href="#本节任务" class="headerlink" title="本节任务"></a>本节任务</h2>
                <p>本次我们需要完成的任务是 完成两台主机通过中间主机的数据通信（网络层）</p>
                <ul>
                  <li>增加基于IP地址的转发功能</li>
                  <li>增加网络层封装</li>
                </ul>
                <p>其实最主要的就是基于IP地址的转发功能，网络层的封装其实我们在初级功能中就已经做好了。</p>
                <h2 id="原理"><a href="#原理" class="headerlink" title="原理"></a>原理</h2>
                <p>首先，实验的思路是A通过中间主机B向C发送数据。那么B则作为一个路由器，B要监听两个网卡，一个网卡发来的数据通过另一个网卡发出去。 示意图如下： A————-&gt;B1===B2——————&gt;C 从图上可以看出，B主机的两个网卡数据互通，A和B1则处于一个局域网内，B2和C处于另一个局域网内。 就比如这样，现在室友A在用有线上网，我的电脑B也在用有线上网，我们的有线处在同一局域网，我的电脑B同时散着一个无线网，我的手机C又连接到了这个无线上。 那么要实现A到C的数据传送，即模拟室友A要发送数据到我的手机C，那么流程则是这样的： 室友A在有线局域网发送数据到我的网卡B1，B1将数据通过网卡B2转发到无线局域网，通过无线局域网到达我的手机C。 A的发送要构建一个帧，目的MAC地址为B1,目的IP为C。B则要开启两个网卡，B1监听接收数据，B2网卡则要用ARP协议扫描所在无线局域网内的IP和MAC,B获取到了A发来的帧之后，解析它的IP地址和MAC地址，匹配刚才扫描得到的IP和MAC对应表，将源MAC换成B2网卡MAC，目的MAC换成C的MAC，IP不变，数据data不变。构建新帧之后发送出去。 好啦，思路大体就是这样。</p>
                <h2 id="实战"><a href="#实战" class="headerlink" title="实战"></a>实战</h2>
                <p>需要三个程序，一个是发送，一个路由，一个接收。所以一共三个程序要同时运行起来执行。 以上是我的大体思路，如有错误，还请指正。现已用代码实现完毕。 代码暂不公开，只提供部分重点代码解析：</p>
                <h3 id="一、发送端"><a href="#一、发送端" class="headerlink" title="一、发送端"></a>一、发送端</h3>
                <p>其实发送端和初级功能的发送差不多 个人编写的交互流程如下：</p>
                <figure class="highlight angelscript">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line">IP地址:<span class="number">121.250</span><span class="number">.216</span><span class="number">.221</span>   MAC地址:<span class="number">3</span>c970e4b56d6con:<span class="number">127</span></span><br><span class="line"></span><br><span class="line">-------------------------------------------</span><br><span class="line">IP地址:<span class="number">121.250</span><span class="number">.216</span><span class="number">.227</span>   MAC地址:<span class="number">089e01</span>b948f4con:<span class="number">128</span></span><br><span class="line"></span><br><span class="line">-------------------------------------------</span><br><span class="line">IP地址:<span class="number">121.250</span><span class="number">.216</span><span class="number">.228</span>   MAC地址:<span class="number">10</span>bf48705aeecon:<span class="number">129</span></span><br><span class="line"></span><br><span class="line">获取MAC地址完毕,请输入你要发送对方的IP地址:</span><br><span class="line"><span class="number">192.168</span><span class="number">.1</span><span class="number">.3</span></span><br><span class="line">请输入你要发送的内容:</span><br><span class="line">im cqc</span><br><span class="line">要发送的内容:im cqc</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>具体代码不再解析，同上一篇初级功能。</p>
                <h3 id="二、路由端"><a href="#二、路由端" class="headerlink" title="二、路由端"></a>二、路由端</h3>
                <p>首先要开启两个网卡，声明两个网卡对象和处理器</p>
                <figure class="highlight cpp">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="keyword">pcap_if_t</span>  *d,*d2;					<span class="comment">//选中的网络适配器</span></span><br><span class="line"><span class="keyword">pcap_t</span> *adhandle,*adhandle2;           <span class="comment">//捕捉实例,是pcap_open返回的对象,adhandle是用来发送数据，adhandle2是用来接收数据</span></span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>一个用来接收一个用来发送，这里定义了adhandle是用来发送，adhandle2是用来接收数据。 那么打开适配器就在main方法中，提前打开两个网卡</p>
                <figure class="highlight xl">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line">int num;</span><br><span class="line">	printf(<span class="string">"请输入你要转发数据的网卡代号:\n"</span>);</span><br><span class="line">	<span class="comment">//让用户选择选择哪个适配器进行转发</span></span><br><span class="line">	scanf_s(<span class="string">"%d"</span>,&amp;num);</span><br><span class="line"></span><br><span class="line">	<span class="comment">//跳转到选中的适配器</span></span><br><span class="line">	<span class="function"><span class="title">for</span>(d=alldevs, i=0; i&lt; num-1 ; d=d-&gt;</span>next, i++);</span><br><span class="line"></span><br><span class="line">	<span class="comment">//运行到此处说明用户的输入是合法的，找到发送数据网卡</span></span><br><span class="line">	<span class="function"><span class="title">if</span>((adhandle = pcap_open(d-&gt;</span><span class="keyword">name</span>,		<span class="comment">//设备名称</span></span><br><span class="line">													<span class="number">65535</span>,       <span class="comment">//存放数据包的内容长度</span></span><br><span class="line">													PCAP_OPENFLAG_PROMISCUOUS,  <span class="comment">//混杂模式</span></span><br><span class="line">													<span class="number">1000</span>,           <span class="comment">//超时时间</span></span><br><span class="line">													NULL,          <span class="comment">//远程验证</span></span><br><span class="line">													errbuf         <span class="comment">//错误缓冲</span></span><br><span class="line">													)) == NULL)&#123;</span><br><span class="line">    <span class="comment">//打开适配器失败,打印错误并释放适配器列表</span></span><br><span class="line">	<span class="function"><span class="title">fprintf</span>(stderr,"\nUnable to open the adapter. %s <span class="keyword">is</span> <span class="built_in">not</span> supported <span class="keyword">by</span> WinPcap\n", d-&gt;</span><span class="keyword">name</span>);</span><br><span class="line">    <span class="comment">// 释放设备列表 </span></span><br><span class="line">    pcap_freealldevs(alldevs);</span><br><span class="line">    return -<span class="number">1</span>;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	int num2;</span><br><span class="line">	printf(<span class="string">"请输入你要接收数据的网卡代号:"</span>);</span><br><span class="line">	<span class="comment">//让用户选择用哪个网卡来收数据</span></span><br><span class="line">	scanf_s(<span class="string">"%d"</span>,&amp;num2);</span><br><span class="line">	<span class="comment">//用户输入的数字超出合理范围</span></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">	<span class="comment">//跳转到选中的适配器</span></span><br><span class="line">	<span class="function"><span class="title">for</span>(d2=alldevs, i=0; i&lt; num2-1 ; d2=d2-&gt;</span>next, i++);</span><br><span class="line"></span><br><span class="line">	<span class="comment">//运行到此处说明用户的输入是合法的</span></span><br><span class="line">	<span class="function"><span class="title">if</span>((adhandle2 = pcap_open(d2-&gt;</span><span class="keyword">name</span>,		<span class="comment">//设备名称</span></span><br><span class="line">													<span class="number">65535</span>,       <span class="comment">//存放数据包的内容长度</span></span><br><span class="line">													PCAP_OPENFLAG_PROMISCUOUS,  <span class="comment">//混杂模式</span></span><br><span class="line">													<span class="number">1000</span>,           <span class="comment">//超时时间</span></span><br><span class="line">													NULL,          <span class="comment">//远程验证</span></span><br><span class="line">													errbuf         <span class="comment">//错误缓冲</span></span><br><span class="line">													)) == NULL)&#123;</span><br><span class="line">    <span class="comment">//打开适配器失败,打印错误并释放适配器列表</span></span><br><span class="line">	<span class="function"><span class="title">fprintf</span>(stderr,"\nUnable to open the adapter. %s <span class="keyword">is</span> <span class="built_in">not</span> supported <span class="keyword">by</span> WinPcap\n", d2-&gt;</span><span class="keyword">name</span>);</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>接下来用用于发送的handle处理器来扫描它的局域网IP，获得局域网内的MAC地址，记录在一个表中,存放IP和MAC的对应关系。 这个表可以用结构体数组来保存，比如可以这样:</p>
                <figure class="highlight routeros">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line">struct ip_mac_list&#123;</span><br><span class="line">	IpAddress ip;</span><br><span class="line">	unsigned char mac[6];</span><br><span class="line">&#125;;</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <figure class="highlight angelscript">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line">ip_mac_list  list[<span class="number">256</span>];                       <span class="comment">//存储IP和MAC地址的对应表</span></span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>那么以上便是准备工作，我们完成了两个网卡的打开，发送网卡扫描获取局域网MAC，接下来便是最重要的监听加转发。 那么这个怎办？那就开一个新线程。 让我们声明一个新的路由线程。</p>
                <figure class="highlight lisp">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line">DWORD WINAPI RouteThread(<span class="name">LPVOID</span> lpParameter)<span class="comment">;</span></span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>那么线程要接收进来什么参数呢？ 首先必须要的是两个网卡处理器，在main方法中已经做好初始化的adhandle和adhandle2，另外还有alldevs，可以持有这个指针来释放设备列表，出现错误时释放资源并退出。 初级功能中声明过了 struct sparam sp; struct gparam gp; 这两个就是发送ARP线程和接收ARP线程中的两个参数，那么仿照这个功能，我们定义一个新的结构体</p>
                <figure class="highlight cpp">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">rparam</span>&#123;</span></span><br><span class="line">	<span class="keyword">pcap_t</span> *adhandle_rec;</span><br><span class="line">	<span class="keyword">pcap_t</span> *adhandle_send;</span><br><span class="line">	<span class="keyword">pcap_if_t</span>  * alldevs;       <span class="comment">//所有网络适配器</span></span><br><span class="line">&#125;;</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>在main方法中把它来初始化赋值</p>
                <figure class="highlight abnf">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line">rp.adhandle_send = adhandle<span class="comment">;</span></span><br><span class="line">	rp.adhandle_rec = adhandle2<span class="comment">;</span></span><br><span class="line">	rp.alldevs = alldevs<span class="comment">;</span></span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>当做参数传入这个线程</p>
                <figure class="highlight lisp">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line">routethread = CreateThread(<span class="name">NULL</span>, <span class="number">0</span>, (<span class="name">LPTHREAD_START_ROUTINE</span>) RouteThread, <span class="symbol">&amp;rp</span>,</span><br><span class="line">			<span class="number">0</span>, NULL)<span class="comment">;</span></span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>其中第四个参数就是传递了这个结构体进去。注意这个语句最好不要直接放在main方法中直接调用，可以在全部获取完MAC地址之后再开启这个线程。 那么接下来就说一下这个线程都干了些什么，只简略说一下核心部分。 首先开启了这个线程之后会一直都在执行，那么就可以加入</p>
                <figure class="highlight lisp">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line">while((<span class="name">res</span> = pcap_next_ex(<span class="name">adhandle2</span>,<span class="symbol">&amp;header</span>,<span class="symbol">&amp;pkt_data</span>))&gt;=0)</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>这样的while判断语句来一直监听数据包的接收，然后解析数据。</p>
                <figure class="highlight perl">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line">ethernet =  (EthernetHeader *)(pkt_data);</span><br><span class="line">			<span class="keyword">for</span>(<span class="keyword">int</span> i=<span class="number">0</span>;i&lt;<span class="number">6</span>;i++)&#123;</span><br><span class="line">				sou_mac[i] = ethernet-&gt;SourMAC[i];</span><br><span class="line">			&#125;</span><br><span class="line">			<span class="keyword">for</span>(<span class="keyword">int</span> i=<span class="number">0</span>;i&lt;<span class="number">6</span>;i++)&#123;</span><br><span class="line">				des_mac[i] = ethernet-&gt;DestMAC[i];</span><br><span class="line">			&#125;</span><br><span class="line">			// 获得IP数据包头部的位置</span><br><span class="line">			ip = (IpHeader *) (pkt_data +<span class="number">14</span>);    <span class="regexp">//</span><span class="number">14</span>为以太网帧头部长度</span><br><span class="line">			//获得TCP头部的位置</span><br><span class="line">			ip_len = (ip-&gt;Version_HLen &amp; <span class="number">0xf</span>) *<span class="number">4</span>;</span><br><span class="line">			tcp = (TcpHeader *)((u_char *)ip+ip_len);</span><br><span class="line">			data = (char *)((u_char *)tcp+<span class="number">20</span>);</span><br><span class="line">			<span class="keyword">printf</span>(<span class="string">"data:%s\n"</span>,data);</span><br><span class="line">			<span class="keyword">printf</span>(<span class="string">"ip:"</span>);</span><br><span class="line">			<span class="keyword">printf</span>(<span class="string">"%d.%d.%d.%d -&gt; %d.%d.%d.%d\n"</span>,</span><br><span class="line">					ip-&gt;SourceAddr.byte1,</span><br><span class="line">					ip-&gt;SourceAddr.byte2,</span><br><span class="line">					ip-&gt;SourceAddr.byte3,</span><br><span class="line">					ip-&gt;SourceAddr.byte4,</span><br><span class="line">				    ip-&gt;DestinationAddr.byte1,</span><br><span class="line">				    ip-&gt;DestinationAddr.byte2,</span><br><span class="line">				    ip-&gt;DestinationAddr.byte3,</span><br><span class="line">				    ip-&gt;DestinationAddr.byte4);</span><br><span class="line">			 <span class="keyword">printf</span>(<span class="string">"sou_mac:%02x-%02x-%02x-%02x-%02x-%02x\n"</span>, sou_mac[<span class="number">0</span>], sou_mac[<span class="number">1</span>], sou_mac[<span class="number">2</span>],</span><br><span class="line">			    sou_mac[<span class="number">3</span>], sou_mac[<span class="number">4</span>], sou_mac[<span class="number">5</span>]);</span><br><span class="line">			<span class="keyword">printf</span>(<span class="string">"des_mac:%02x-%02x-%02x-%02x-%02x-%02x\n"</span>, des_mac[<span class="number">0</span>], des_mac[<span class="number">1</span>], des_mac[<span class="number">2</span>],</span><br><span class="line">			    des_mac[<span class="number">3</span>], des_mac[<span class="number">4</span>], des_mac[<span class="number">5</span>]);</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>然后接下来每接收到一个数据，就进行构建新的帧转发出去，目的MAC先匹配list表，如果list没有找到，那么我让他指定了一个mac，比如广播MAC。源MAC地址则赋值网卡的MAC地址。 注意，传统以太网中数据长度为45-1500，那么我在构建前把解析出的data作了下判断长度再构建，因为我已经把sendbuffer声明为一个固定长度了，为了防止越界，我先进行一个长度判断。</p>
                <figure class="highlight lsl">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="comment">//以下开始构建帧发送</span></span><br><span class="line">		<span class="comment">//首先判断data最大值小于1500</span></span><br><span class="line">		if(strlen(data)&lt;<span class="number">1500</span>)&#123;</span><br><span class="line">			<span class="comment">//目的MAC</span></span><br><span class="line">			BYTE send_destmac[<span class="number">6</span>];</span><br><span class="line">			bool findMac = false;</span><br><span class="line">			for(int c = <span class="number">0</span>;c&lt;con;c++)&#123;</span><br><span class="line">				if(ip-&gt;DestinationAddr.byte1 ==  <span class="type">list</span>[c].ip.byte1&amp;&amp;</span><br><span class="line">					ip-&gt;DestinationAddr.byte2 == <span class="type">list</span>[c].ip.byte2&amp;&amp;</span><br><span class="line">					ip-&gt;DestinationAddr.byte3 == <span class="type">list</span>[c].ip.byte3&amp;&amp;</span><br><span class="line">					ip-&gt;DestinationAddr.byte4 == <span class="type">list</span>[c].ip.byte4)</span><br><span class="line">				&#123;</span><br><span class="line">					printf(<span class="string">"Find its MAC!<span class="subst">\n</span>"</span>);</span><br><span class="line">					findMac = true;</span><br><span class="line">					send_destmac[<span class="number">0</span>] = <span class="type">list</span>[c].mac[<span class="number">0</span>];   </span><br><span class="line">					send_destmac[<span class="number">1</span>] = <span class="type">list</span>[c].mac[<span class="number">1</span>];</span><br><span class="line">					send_destmac[<span class="number">2</span>] = <span class="type">list</span>[c].mac[<span class="number">2</span>];</span><br><span class="line">					send_destmac[<span class="number">3</span>] = <span class="type">list</span>[c].mac[<span class="number">3</span>];</span><br><span class="line">					send_destmac[<span class="number">4</span>] = <span class="type">list</span>[c].mac[<span class="number">4</span>];</span><br><span class="line">					send_destmac[<span class="number">5</span>] = <span class="type">list</span>[c].mac[<span class="number">5</span>];</span><br><span class="line">				&#125;</span><br><span class="line">			&#125;</span><br><span class="line">			if(!findMac)&#123;</span><br><span class="line">				send_destmac[<span class="number">0</span>] = <span class="number">0xff</span>;   </span><br><span class="line">				send_destmac[<span class="number">1</span>] = <span class="number">0xff</span>;   </span><br><span class="line">				send_destmac[<span class="number">2</span>] = <span class="number">0xff</span>;   </span><br><span class="line">				send_destmac[<span class="number">3</span>] = <span class="number">0xff</span>;   </span><br><span class="line">				send_destmac[<span class="number">4</span>] = <span class="number">0xff</span>;   </span><br><span class="line">				send_destmac[<span class="number">5</span>] = <span class="number">0xff</span>;   </span><br><span class="line">			&#125;</span><br><span class="line">			printf(<span class="string">"destmac:%02x-%02x-%02x-%02x-%02x-%02x<span class="subst">\n</span>"</span>,</span><br><span class="line">				send_destmac[<span class="number">0</span>],send_destmac[<span class="number">1</span>],send_destmac[<span class="number">2</span>],</span><br><span class="line">				send_destmac[<span class="number">3</span>],send_destmac[<span class="number">4</span>],send_destmac[<span class="number">5</span>]</span><br><span class="line">				);</span><br><span class="line">			memcpy(send_ethernet.DestMAC, send_destmac, <span class="number">6</span>);</span><br><span class="line">			<span class="comment">//源MAC地址</span></span><br><span class="line">			BYTE send_hostmac[<span class="number">6</span>];</span><br><span class="line">			<span class="comment">//源MAC地址</span></span><br><span class="line">			send_hostmac[<span class="number">0</span>] = local_mac[<span class="number">0</span>];     <span class="comment">//赋值本地MAC地址</span></span><br><span class="line">			send_hostmac[<span class="number">1</span>] = local_mac[<span class="number">1</span>];</span><br><span class="line">			send_hostmac[<span class="number">2</span>] = local_mac[<span class="number">2</span>];</span><br><span class="line">			send_hostmac[<span class="number">3</span>] = local_mac[<span class="number">3</span>];</span><br><span class="line">			send_hostmac[<span class="number">4</span>] = local_mac[<span class="number">4</span>];</span><br><span class="line">			send_hostmac[<span class="number">5</span>] = local_mac[<span class="number">5</span>];</span><br><span class="line">			<span class="comment">//赋值源MAC地址</span></span><br><span class="line">			memcpy(send_ethernet.SourMAC, send_hostmac, <span class="number">6</span>);</span><br><span class="line">			send_ethernet.EthType = htons(<span class="number">0x0800</span>);</span><br><span class="line">			<span class="comment">//赋值SendBuffer</span></span><br><span class="line">			memcpy(&amp;SendBuffer, &amp;send_ethernet, sizeof(struct EthernetHeader));</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>以上只是赋值了帧头，至于IP头，TCP头，数据的赋值就参照初级功能的来赋值吧，不要忘了校验和的检验。好，大体上就是这样，接受来数据包并转发出去的原理就是这样。</p>
                <h3 id="三、接收"><a href="#三、接收" class="headerlink" title="三、接收"></a>三、接收</h3>
                <p>不用多改，就是初级功能中的接收，在此写一写小小的优化措施，防止接收到过多的数据帧而造成不断乱蹦，导致你看不到接收的东西。 在打印的时候加一个过滤就好了。部分代码如下： 在main方法中提示用户输入要接收的IP地址</p>
                <figure class="highlight angelscript">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line">printf(<span class="string">"请输入要接收的IP地址,输入0.0.0.0代表全部接收,请输入\n"</span>);</span><br><span class="line">	<span class="built_in">bool</span> receiveAll = <span class="literal">false</span>;</span><br><span class="line">	u_int ip1,ip2,ip3,ip4;</span><br><span class="line">	<span class="built_in">bool</span> legal = <span class="literal">false</span>;</span><br><span class="line">	<span class="keyword">while</span>(!legal)&#123;</span><br><span class="line">		scanf_s(<span class="string">"%d.%d.%d.%d"</span>,&amp;ip1,&amp;ip2,&amp;ip3,&amp;ip4);</span><br><span class="line">		<span class="keyword">if</span>(ip1==<span class="number">0</span>&amp;&amp;ip2==<span class="number">0</span>&amp;&amp;ip3==<span class="number">0</span>&amp;&amp;ip4==<span class="number">0</span>)&#123;</span><br><span class="line">			receiveAll = <span class="literal">true</span>;</span><br><span class="line">			legal = <span class="literal">true</span>;</span><br><span class="line">			<span class="keyword">break</span>;</span><br><span class="line">		&#125;</span><br><span class="line">		<span class="keyword">if</span>(ip1&lt;<span class="number">0</span>||ip1&gt;<span class="number">255</span>||ip2&lt;<span class="number">0</span>||ip2&gt;<span class="number">255</span>||ip3&lt;<span class="number">0</span>||ip3&gt;<span class="number">255</span>||ip4&lt;<span class="number">1</span>||ip4&gt;<span class="number">254</span>)&#123;</span><br><span class="line">			legal = <span class="literal">false</span>;</span><br><span class="line">			printf(<span class="string">"对不起,IP输入不合法,请重新输入:\n"</span>);</span><br><span class="line">		&#125;<span class="keyword">else</span>&#123;</span><br><span class="line">			legal = <span class="literal">true</span>;</span><br><span class="line">		&#125;</span><br><span class="line">	&#125;</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>打印时的判断</p>
                <figure class="highlight perl">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="keyword">if</span>(receiveAll||(ip-&gt;SourceAddr.byte1==ip1&amp;&amp;</span><br><span class="line">					ip-&gt;SourceAddr.byte2==ip2&amp;&amp;</span><br><span class="line">					ip-&gt;SourceAddr.byte3==ip3&amp;&amp;</span><br><span class="line">					ip-&gt;SourceAddr.byte4==ip4))&#123;</span><br><span class="line">					<span class="keyword">printf</span>(<span class="string">"%d.%d.%d.%d.%d -&gt; %d.%d.%d.%d.%d\n"</span>,</span><br><span class="line">					ip-&gt;SourceAddr.byte1,</span><br><span class="line">					ip-&gt;SourceAddr.byte2,</span><br><span class="line">					ip-&gt;SourceAddr.byte3,</span><br><span class="line">					ip-&gt;SourceAddr.byte4,</span><br><span class="line">				    sport,</span><br><span class="line">				    ip-&gt;DestinationAddr.byte1,</span><br><span class="line">				    ip-&gt;DestinationAddr.byte2,</span><br><span class="line">				    ip-&gt;DestinationAddr.byte3,</span><br><span class="line">				    ip-&gt;DestinationAddr.byte4,</span><br><span class="line">				    dport);</span><br><span class="line">			    <span class="keyword">printf</span>(<span class="string">"sou_mac:%02x-%02x-%02x-%02x-%02x-%02x\n"</span>, sou_mac[<span class="number">0</span>], sou_mac[<span class="number">1</span>], sou_mac[<span class="number">2</span>],</span><br><span class="line">			    sou_mac[<span class="number">3</span>], sou_mac[<span class="number">4</span>], sou_mac[<span class="number">5</span>]);</span><br><span class="line">				<span class="keyword">printf</span>(<span class="string">"des_mac:%02x-%02x-%02x-%02x-%02x-%02x\n"</span>, des_mac[<span class="number">0</span>], des_mac[<span class="number">1</span>], des_mac[<span class="number">2</span>],</span><br><span class="line">			    des_mac[<span class="number">3</span>], des_mac[<span class="number">4</span>], des_mac[<span class="number">5</span>]);</span><br><span class="line">				<span class="keyword">printf</span>(<span class="string">"%s\n"</span>,data);</span><br><span class="line">				<span class="keyword">printf</span>(<span class="string">"-----------------------------------------------------\n"</span>);</span><br><span class="line">			&#125;</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>好，代码就先放送这么多，具体的实现只要有了思路我相信肯定不难，如有问题，欢迎与我交流。</p>
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